Countries will be split into groups across four leagues. The four winners of the top-ranked League A will qualify for the Nations League Finals in June 2019. Those who do not make it will face promotion and relegation, while a potential route into Euro 2020 will also be up for grabs.

HOW WILL IT BE FORMED?

The 55 member associations have been split into four Leagues according to their respective coefficients, with those rankings again used to subdivide them into pots. Here's the make-up:

Yes. Ukraine and Russia will be kept apart in League B. In League C, no group will be allowed to contain more than two of Norway, Finland, Estonia and Lithuania due to "winter venue restrictions". Due to "excessive travel restrictions", any League D group can only contain a maximum of one of these pairs: Andorra and Kazakhstan, Faroe Islands and Kazakhstan, Gibraltar and Kazakhstan, Gibraltar and Azerbaijan. Furthermore, Armenia and Azerbaijan will be kept apart in the bottom division.

HOW WILL IT WORK?

While group winners of League A will compete in the Nations League Finals – which will feature semi-finals, a third-place match and the final hosted by one of the sides involved – the victors in Leagues B, C and D gain promotion and the bottom sides from Leagues A, B and C will be relegated. The second season will take place in 2020-21.

HOW CAN YOU QUALIFY FOR EURO 2020?

The qualifiers will remain largely the same but, rather than best third-placed teams advancing to the play-offs, that stage will be contested by the 16 Nations League group winners. If any of them have already qualified for Euro 2020, their place will be taken by the next best-ranked team. The countries will be divided into their four leagues, each of which will include two single-legged semi-finals and a one-off final.

WHEN DOES IT START?

While official fixtures and kick-off times will not be clarified until after the draw, the schedule is as follows: